i have a 2000 Si with ctr pistons and cams. after 11 months the build is finally done. (many thanks to the people of honda-tech for all their help) the engine is complete and i will put it in the car tomorrow after work. i have an obd1 conversion ready to go. i'm just curious - is it possible for me to use ctr pistons and cams and still be obd2? i realize that includes a secondary o2 sensor, but are there any engine management programs for my stock ecu? (this would be a weak attempt at remaining 'legal') also, search is down, so that didnt' help either. any suggestions appreciated.

 

a lot has happened since i first started this thread. the 00 Si ran successfully with crome, a p28, conversion harness and rc310s with an estimated 12:1 compression.

i am going to have to pass cali smog soon and i'll have to be obd2 again. i have done a lot of searching for months now and have found little info.

has anyone passed obd2 smog with ctr pistons? is it possible to run a b16 with ctr pistons and perhaps a stock itr ecu and high octane? and if so would the smog techs (or the computer rather) know that it was an itr ecu, instead of the Si ecu? sorry if i sound like a noob but i figure if anyone can school me it will be someone from this forum.

i'm rebuilding the motor again anyway so swapping pistons, ecu, and injectors again is an undesireable option before i have to smog it, but i dont want to have to do another rebuild after smog to enjoy the ctr's again.

[rant]man fvck cali smog laws. i swear i'm moving one of these days just because of the modification ***** that run this backassward state. [/rant]

anyway question cliffnotes: can you pass cali smog with ctr pistons? can you run a b16 with ctr pistons and an itr ecu (and high octane if necessary)? IF you had an itr ecu in a 00 Si would the smog computer know and would it matter?

 

when you go to smog the car just put the stock ecu back in...should pass...if you need a tuner im just over here in stockton

i also have a obd2b ecu for sale that would work well with that motor

 

I dont think it will pass because they will know its a acura ECU not civic.


Someone correct me if im wrong please but i remember reading the above!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2k.civic.si &raquo;</TD></TR><TR><TD CLASS="quote">when you go to smog the car just put the stock ecu back in...should pass...</TD></TR></TABLE>

ok so for smog purposes lets say i try to run my 00 Si with CTR pistons/cams AND the stock ecu and stock injectors. This is an estimated 12:1 compression, probably less. Would this be at all safe for the motor if the octane was high enough? and if so, what octane would be desireable? also if the ecu/injectors were stock, should i then revert back to stock I/E manifolds?

 

the problem with 12:1 CR is the NOx emissions. You should get the hydrocarbons and carbon monoxide down if the tuning is right and your cat is nice and hot before the test (drive it around a bit before you go in.

I don't know what you California guys do in terms of using additives that can help bring down the NOx for the emissions test though.


Modified by Michael Delaney at 10:17 AM 12/27/2005

 

i dont think that motor will pass. If you run the high compression and run a stock ecu, it will run on the lean side, that will raise NOx. If you richen it up, you will fail for HC and CO. I put my built motor on a gas analyzer and the hc were off the charts

 

ive seen quite a few cars pass that shouldnt have..you would be suprised by the margin they allow and still pass...i bet i could get him to pass

 

*reviving this thread* I MUST pass Cali OBD2 smog by May 1 2006.

i get my block/head back from the shop today. I will reassemble/install all weekend.

I will use stock ECU/manifolds/injectors/cat/o2/etc. But I am using CTR pistons and cams (i could use stock cams if that makes a diff).

What is more important here in terms of getting the emissions right with these pistons: the amount of fuel, the octane level of the fuel, or the compression ratio?

I have a brand new cat. I also have a thickass custom head gasket (.062" i think) that should lower the compression. I might just put this on for smog purposes.

I'm totallywilling to yank the head again to swap out all the goodies (manifolds/injectors/headgasket/possibly cams/etc.) after passing smog so that I can once again be obd1 and then get tuned with crome.

So - once again, to pass Cali smog with CTR pistons, what kind of things should I focus on? fuel pressure? octane? compression?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ( o )( o ) &raquo;</TD></TR><TR><TD CLASS="quote">*reviving this thread* I MUST pass Cali OBD2 smog by May 1 2006.

i get my block/head back from the shop today. I will reassemble/install all weekend.

I will use stock ECU/manifolds/injectors/cat/o2/etc. But I am using CTR pistons and cams (i could use stock cams if that makes a diff).

What is more important here in terms of getting the emissions right with these pistons: the amount of fuel, the octane level of the fuel, or the compression ratio?

I have a brand new cat. I also have a thickass custom head gasket (.062" i think) that should lower the compression. I might just put this on for smog purposes.

I'm totallywilling to yank the head again to swap out all the goodies (manifolds/injectors/headgasket/possibly cams/etc.) after passing smog so that I can once again be obd1 and then get tuned with crome.

So - once again, to pass Cali smog with CTR pistons, what kind of things should I focus on? fuel pressure? octane? compression? </TD></TR></TABLE>

bump. just picked up my block and head. reassembly begins tonight. i'm planning on using the thick headgasket to ensure some lower compression. the head was only milled very minimally, just a few thousandths. also - can i run my plx wideband o2 with the stock ecu so i can monitor air/fuel ratio?

 

bump

cliffnotes:

2000 Si, need to pass Cali Smog. for smog purposes, i am removing obd1 modifications and will be completely stock except for CTR pistons. i will use a thick headgasket to lower compression. i also have a brand new cat.

can i use my wideband with the stock ecu? for passing emissions with these pistons in a stock setup, what kind of things should I focus on? fuel pressure? octane? lowering compression?

00Red_SiR said this on that 20 page CTR piston thread:
"A stock b16 with pct's in it has a comp ratio of about 11.64:1", with my thick gasket I would guess I'd be even lower than that.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ( o )( o ) &raquo;</TD></TR><TR><TD CLASS="quote">
cliffnotes:

2000 Si, need to pass Cali Smog. for smog purposes, i am removing obd1 modifications and will be completely stock except for CTR pistons. i will use a thick headgasket to lower compression. i also have a brand new cat.

can i use my wideband with the stock ecu? for passing emissions with these pistons in a stock setup, what kind of things should I focus on? fuel pressure? octane? lowering compression?

00Red_SiR said this on that 20 page CTR piston thread:
"A stock b16 with pct's in it has a comp ratio of about 11.64:1", with my thick gasket I would guess I'd be even lower than that. </TD></TR></TABLE>

bump for expert knowledge. i dont know what better forum to turn to. i know there are people here who know much more about this than i do. happy Friday to all. i hope to get some good answers before i install this weekend.

 

if its going to pass it doesnt matter if its an acura or honda ecu computer doesnt check for all that. it just scans for any codes that are being sent out by the ecu. but it does need to be a obd2 ecu

 

cool. i'm going with the stock 00 Si ecu (p2t or something like that). i'm just more concerned about running lean with those pistons and damaging the cylinders or something...Which is why i' dlike to figure out if i can rig the wideband to the stock ecu in place of the regular o2. also what effects emmissions more, the amount of fuel or octane level?

 

what about cam timing? would playing with that help minimize emissions while keeping the pistons sufficiently fueled? i ask because nows the time to put on adjustable gears vs. the stock cam gears already on.